The Revel F208 are not very demanding, but are best served by amps that can deliver into 4 ohm load as its in the 4-7 ohm range through the audio band.
That particular Paradigm doesn't have a test I was able to find, but its larger brother does and it does appear to be little lighter load, but it still would best be served by a 4 ohm capable amp as it dips down in that region, just not as long or often as the Revel.
I would not take any dealers word on dismissing a listen to other speakers. We all have different priorities out of our systems and what works best for one might not for another.